package/mac80211/src/mac80211/ieee80211_iface.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10 #include <linux/kernel.h>
  11 #include <linux/if_arp.h>
  12 #include <linux/netdevice.h>
  13 #include <linux/rtnetlink.h>
  14 #include <net/mac80211.h>
  15 #include "ieee80211_i.h"
  16 #include "sta_info.h"
  17 #include "debugfs_netdev.h"
  18
  19 void ieee80211_if_sdata_init(struct ieee80211_sub_if_data *sdata)
  20 {
  21         int i;
  22
  23         /* Default values for sub-interface parameters */
  24         sdata->drop_unencrypted = 0;
  25         sdata->eapol = 1;
  26         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
  27                 skb_queue_head_init(&sdata->fragments[i].skb_list);
  28 }
  29
  30 static void ieee80211_if_sdata_deinit(struct ieee80211_sub_if_data *sdata)
  31 {
  32         int i;
  33
  34         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
  35                 __skb_queue_purge(&sdata->fragments[i].skb_list);
  36         }
  37 }
  38
  39 /* Must be called with rtnl lock held. */
  40 int ieee80211_if_add(struct net_device *dev, const char *name,
  41                      struct net_device **new_dev, int type)
  42 {
  43         struct net_device *ndev;
  44         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
  45         struct ieee80211_sub_if_data *sdata = NULL;
  46         int ret;
  47
  48         ASSERT_RTNL();
  49         ndev = alloc_netdev(sizeof(struct ieee80211_sub_if_data),
  50                             name, ieee80211_if_setup);
  51         if (!ndev)
  52                 return -ENOMEM;
  53
  54         ret = dev_alloc_name(ndev, ndev->name);
  55         if (ret < 0)
  56                 goto fail;
  57
  58         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
  59         ndev->base_addr = dev->base_addr;
  60         ndev->irq = dev->irq;
  61         ndev->mem_start = dev->mem_start;
  62         ndev->mem_end = dev->mem_end;
  63         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
  64
  65         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
  66         ndev->ieee80211_ptr = &sdata->wdev;
  67         sdata->wdev.wiphy = local->hw.wiphy;
  68         sdata->type = IEEE80211_IF_TYPE_AP;
  69         sdata->dev = ndev;
  70         sdata->local = local;
  71         ieee80211_if_sdata_init(sdata);
  72
  73         ret = register_netdevice(ndev);
  74         if (ret)
  75                 goto fail;
  76
  77         ieee80211_debugfs_add_netdev(sdata);
  78         ieee80211_if_set_type(ndev, type);
  79
  80         write_lock_bh(&local->sub_if_lock);
  81         if (unlikely(local->reg_state == IEEE80211_DEV_UNREGISTERED)) {
  82                 write_unlock_bh(&local->sub_if_lock);
  83                 __ieee80211_if_del(local, sdata);
  84                 return -ENODEV;
  85         }
  86         list_add(&sdata->list, &local->sub_if_list);
  87         if (new_dev)
  88                 *new_dev = ndev;
  89         write_unlock_bh(&local->sub_if_lock);
  90
  91         ieee80211_update_default_wep_only(local);
  92
  93         return 0;
  94
  95 fail:
  96         free_netdev(ndev);
  97         return ret;
  98 }
  99
 100 int ieee80211_if_add_mgmt(struct ieee80211_local *local)
 101 {
 102         struct net_device *ndev;
 103         struct ieee80211_sub_if_data *nsdata;
 104         int ret;
 105
 106         ASSERT_RTNL();
 107
 108         ndev = alloc_netdev(sizeof(struct ieee80211_sub_if_data), "wmgmt%d",
 109                             ieee80211_if_mgmt_setup);
 110         if (!ndev)
 111                 return -ENOMEM;
 112         ret = dev_alloc_name(ndev, ndev->name);
 113         if (ret < 0)
 114                 goto fail;
 115
 116         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 117         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
 118
 119         nsdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 120         ndev->ieee80211_ptr = &nsdata->wdev;
 121         nsdata->wdev.wiphy = local->hw.wiphy;
 122         nsdata->type = IEEE80211_IF_TYPE_MGMT;
 123         nsdata->dev = ndev;
 124         nsdata->local = local;
 125         ieee80211_if_sdata_init(nsdata);
 126
 127         ret = register_netdevice(ndev);
 128         if (ret)
 129                 goto fail;
 130
 131         ieee80211_debugfs_add_netdev(nsdata);
 132
 133         if (local->open_count > 0)
 134                 dev_open(ndev);
 135         local->apdev = ndev;
 136         return 0;
 137
 138 fail:
 139         free_netdev(ndev);
 140         return ret;
 141 }
 142
 143 void ieee80211_if_del_mgmt(struct ieee80211_local *local)
 144 {
 145         struct net_device *apdev;
 146
 147         ASSERT_RTNL();
 148         apdev = local->apdev;
 149         ieee80211_debugfs_remove_netdev(IEEE80211_DEV_TO_SUB_IF(apdev));
 150         local->apdev = NULL;
 151         unregister_netdevice(apdev);
 152 }
 153
 154 void ieee80211_if_set_type(struct net_device *dev, int type)
 155 {
 156         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 157         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 158         int oldtype = sdata->type;
 159
 160         sdata->type = type;
 161         switch (type) {
 162         case IEEE80211_IF_TYPE_WDS:
 163                 sdata->bss = NULL;
 164                 break;
 165         case IEEE80211_IF_TYPE_VLAN:
 166                 break;
 167         case IEEE80211_IF_TYPE_AP:
 168                 sdata->u.ap.dtim_period = 2;
 169                 sdata->u.ap.force_unicast_rateidx = -1;
 170                 sdata->u.ap.max_ratectrl_rateidx = -1;
 171                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 172                 sdata->bss = &sdata->u.ap;
 173                 break;
 174         case IEEE80211_IF_TYPE_STA:
 175         case IEEE80211_IF_TYPE_IBSS: {
 176                 struct ieee80211_sub_if_data *msdata;
 177                 struct ieee80211_if_sta *ifsta;
 178
 179                 ifsta = &sdata->u.sta;
 180                 INIT_WORK(&ifsta->work, ieee80211_sta_work);
 181                 setup_timer(&ifsta->timer, ieee80211_sta_timer,
 182                             (unsigned long) sdata);
 183                 skb_queue_head_init(&ifsta->skb_queue);
 184
 185                 init_timer(&ifsta->admit_timer);
 186                 ifsta->admit_timer.data = (unsigned long) dev;
 187                 ifsta->admit_timer.function = ieee80211_admit_refresh;
 188
 189                 ifsta->capab = WLAN_CAPABILITY_ESS;
 190                 ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
 191                         IEEE80211_AUTH_ALG_SHARED_KEY;
 192                 ifsta->create_ibss = 1;
 193                 ifsta->wmm_enabled = 1;
 194                 ifsta->ht_enabled = 1;
 195                 ifsta->auto_channel_sel = 1;
 196                 ifsta->auto_bssid_sel = 1;
 197
 198                 /* Initialize non-AP QSTA QoS Params */
 199                 ifsta->dot11EDCAAveragingPeriod = 5;
 200                 ifsta->MPDUExchangeTime = 0;
 201 #ifdef CONFIG_MAC80211_DEBUGFS
 202                 ifsta->tspec.nominal_msdu_size = cpu_to_le16(200),
 203                 ifsta->tspec.inactivity_interval = cpu_to_le32(40),
 204                 ifsta->tspec.mean_data_rate = cpu_to_le32(40000),
 205                 ifsta->tspec.min_phy_rate = cpu_to_le32(6000000),
 206                 ifsta->tspec.surplus_band_allow = cpu_to_le16(8192),
 207                 ifsta->tspec.medium_time = cpu_to_le16(30),
 208 #endif
 209
 210                 msdata = IEEE80211_DEV_TO_SUB_IF(sdata->local->mdev);
 211                 sdata->bss = &msdata->u.ap;
 212                 break;
 213         }
 214         case IEEE80211_IF_TYPE_MNTR:
 215                 dev->type = ARPHRD_IEEE80211_RADIOTAP;
 216                 break;
 217         default:
 218                 printk(KERN_WARNING "%s: %s: Unknown interface type 0x%x",
 219                        dev->name, __FUNCTION__, type);
 220         }
 221         ieee80211_debugfs_change_if_type(sdata, oldtype);
 222         ieee80211_update_default_wep_only(local);
 223 }
 224
 225 /* Must be called with rtnl lock held. */
 226 void ieee80211_if_reinit(struct net_device *dev)
 227 {
 228         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 229         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 230         struct sta_info *sta;
 231         int i;
 232
 233         ASSERT_RTNL();
 234         ieee80211_if_sdata_deinit(sdata);
 235         for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
 236                 if (!sdata->keys[i])
 237                         continue;
 238 #if 0
 239                 /* The interface is down at the moment, so there is not
 240                  * really much point in disabling the keys at this point. */
 241                 memset(addr, 0xff, ETH_ALEN);
 242                 if (local->ops->set_key)
 243                         local->ops->set_key(local_to_hw(local), DISABLE_KEY, addr,
 244                                             local->keys[i], 0);
 245 #endif
 246                 ieee80211_key_free(sdata->keys[i]);
 247                 sdata->keys[i] = NULL;
 248         }
 249
 250         switch (sdata->type) {
 251         case IEEE80211_IF_TYPE_AP: {
 252                 /* Remove all virtual interfaces that use this BSS
 253                  * as their sdata->bss */
 254                 struct ieee80211_sub_if_data *tsdata, *n;
 255                 LIST_HEAD(tmp_list);
 256
 257                 write_lock_bh(&local->sub_if_lock);
 258                 list_for_each_entry_safe(tsdata, n, &local->sub_if_list, list) {
 259                         if (tsdata != sdata && tsdata->bss == &sdata->u.ap) {
 260                                 printk(KERN_DEBUG "%s: removing virtual "
 261                                        "interface %s because its BSS interface"
 262                                        " is being removed\n",
 263                                        sdata->dev->name, tsdata->dev->name);
 264                                 list_move_tail(&tsdata->list, &tmp_list);
 265                         }
 266                 }
 267                 write_unlock_bh(&local->sub_if_lock);
 268
 269                 list_for_each_entry_safe(tsdata, n, &tmp_list, list)
 270                         __ieee80211_if_del(local, tsdata);
 271
 272                 kfree(sdata->u.ap.beacon_head);
 273                 kfree(sdata->u.ap.beacon_tail);
 274                 kfree(sdata->u.ap.generic_elem);
 275
 276                 if (dev != local->mdev) {
 277                         struct sk_buff *skb;
 278                         while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
 279                                 local->total_ps_buffered--;
 280                                 dev_kfree_skb(skb);
 281                         }
 282                 }
 283
 284                 break;
 285         }
 286         case IEEE80211_IF_TYPE_WDS:
 287                 sta = sta_info_get(local, sdata->u.wds.remote_addr);
 288                 if (sta) {
 289                         sta_info_put(sta);
 290                         sta_info_free(sta, 0);
 291                 } else {
 292 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 293                         printk(KERN_DEBUG "%s: Someone had deleted my STA "
 294                                "entry for the WDS link\n", dev->name);
 295 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 296                 }
 297                 break;
 298         case IEEE80211_IF_TYPE_STA:
 299         case IEEE80211_IF_TYPE_IBSS:
 300                 kfree(sdata->u.sta.extra_ie);
 301                 sdata->u.sta.extra_ie = NULL;
 302                 kfree(sdata->u.sta.assocreq_ies);
 303                 sdata->u.sta.assocreq_ies = NULL;
 304                 kfree(sdata->u.sta.assocresp_ies);
 305                 sdata->u.sta.assocresp_ies = NULL;
 306                 if (sdata->u.sta.probe_resp) {
 307                         dev_kfree_skb(sdata->u.sta.probe_resp);
 308                         sdata->u.sta.probe_resp = NULL;
 309                 }
 310
 311                 break;
 312         case IEEE80211_IF_TYPE_MNTR:
 313                 dev->type = ARPHRD_ETHER;
 314                 break;
 315         }
 316
 317         /* remove all STAs that are bound to this virtual interface */
 318         sta_info_flush(local, dev);
 319
 320         memset(&sdata->u, 0, sizeof(sdata->u));
 321         ieee80211_if_sdata_init(sdata);
 322 }
 323
 324 /* Must be called with rtnl lock held. */
 325 void __ieee80211_if_del(struct ieee80211_local *local,
 326                         struct ieee80211_sub_if_data *sdata)
 327 {
 328         struct net_device *dev = sdata->dev;
 329
 330         ieee80211_debugfs_remove_netdev(sdata);
 331         unregister_netdevice(dev);
 332         /* Except master interface, the net_device will be freed by
 333          * net_device->destructor (i. e. ieee80211_if_free). */
 334 }
 335
 336 /* Must be called with rtnl lock held. */
 337 int ieee80211_if_remove(struct net_device *dev, const char *name, int id)
 338 {
 339         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 340         struct ieee80211_sub_if_data *sdata, *n;
 341
 342         ASSERT_RTNL();
 343
 344         write_lock_bh(&local->sub_if_lock);
 345         list_for_each_entry_safe(sdata, n, &local->sub_if_list, list) {
 346                 if ((sdata->type == id || id == -1) &&
 347                     strcmp(name, sdata->dev->name) == 0 &&
 348                     sdata->dev != local->mdev) {
 349                         list_del(&sdata->list);
 350                         write_unlock_bh(&local->sub_if_lock);
 351                         __ieee80211_if_del(local, sdata);
 352                         ieee80211_update_default_wep_only(local);
 353                         return 0;
 354                 }
 355         }
 356         write_unlock_bh(&local->sub_if_lock);
 357         return -ENODEV;
 358 }
 359
 360 void ieee80211_if_free(struct net_device *dev)
 361 {
 362         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 363         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 364
 365         /* local->apdev must be NULL when freeing management interface */
 366         BUG_ON(dev == local->apdev);
 367         ieee80211_if_sdata_deinit(sdata);
 368         free_netdev(dev);
 369 }